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 TM 55-1905-219-14-10
5-4. MAIN PROPULSION ENGINE/MARINE GEAR - REMOVAL AND RUN-IN
MAINTENANCE INSTRUCTIONS. (Continued).
LOCATION
ITEM
ACTION
REMARKS
ALIGNMENT
19. Engine
and
Marine
Gear
Alignment
to Pro-
peller
shaft
NOTE
It is important to align the engine and gear only when the boat is afloat and NOT in
dry-dock. During this alignment period, it is also advisable to fill the fuel tanks and
add any other ballast that will be used when boat is in service. With the engine and
gear in position on the engine bed, arrangements must be made to have a
controlled lifting or lowering of each of the four corners of the engine. If threaded
holes are provided in each of the engine mounts, jacking screws can be used in
them. The engine can be raised by screwing down, or lowered by backing off the
desired amount. Steel plates must be inserted under the jacking screws so that the
jacking screws will not damage the engine bed. Lifting can also be accomplished
by the use of properly placed jacks. Adjustable shims also are available and can
simplify the whole problem, particularly for future realign- ment.
(1) It will also be necessary to move the engine and gear from one side or the
other on bed to obtain horizontal alignment. This can be done with a jack placed
horizontally between the engine and the foundation. At the same time, a straight
edge is laid across the edges of the flanges at the top and side to check the
parallel alignment of the coupling edges.
5-36
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